Straightedge



W. L. CLARK. STRAIGHTEDGE.

APPLICATION HLED DUI-29,1919.

1,375,649. Patented Apr. 19, 1921 cm. am

siren s" PATENT OFFICE.

WALTER LYMAN CLARK, OF BOONE, IOWA.

STBAIGI-ITEDGE.

1 '0 all whom it may concern:

Be it known that l, WALTER L. CLARK, a citizen of the United States,residing at Boone, in the county of Boone and State of Iowa, haveinvented new and useful lmproveinents in Straightedges, of which thefollowing is a specification.

This invention relates to a straight edge and has for its primary objectthe construction of a straight edge in which certain parts are soarranged that the length of the straight edge may be increased or theleveling edge of the same spaced from the surface acted upon.

An object of the invention is the construction of a straight edge thatwill not be interfered with by projections or the ir regular portions ofa surface acted upon.

A feature of my invention is the con struction and arrangement of theparts whereby certain elements can be extended in t vo directions withrelation to each end of the straight edge.

With these and other objects in view the invention will be betterunderstood from the following detailed description taken in connectionwith the accompanying drawing wherein- Figure 1. is a side elevation ofthe straight edge.

Fig. 2 is a sectional view showing the block extended.

3 is a sectional view of line 3-3 Fig. 2.

Again referring to the drawing illustrating one construction of myinvention 1 designates a body of the straight edge having the usual handhole 2. In this particular instance the end portions of the straightedge are adjustable and to accomplish this result I provide a pair ofblocks 3 of a shape to form a continuation of the body. Each block hassecured thereto, in any suitable manner, a U shaped member l having itslimbs 5 and 6 slidably mounted in the slots 7 and forming the body 1. Athumb screw 8 is arranged to bind against the member and thereby holdthe block 3 in adjusted position. By this arrangement I am able toincrease the length of the straight edge so that the same may beaccurately arranged in place when used for setting door jambs or similarwork. Often in practice a small projection on the surface acted uponwill Specification of Letters Patent. Patented Apr, 19, 1921 Applicationfiled December 29, 1919.

Serial No. 347,904.

engage the straight edge in such a manner that the same cannot beaccurately arranged 1n place and to overcome this disadvantage l haveillustrated a plunger 9 slidably mounted in each block so that whenarranged in projected position it will space the body of the straightedge from the surface acted upon so that the irregular surface can be sihted relative to the straight edge of the body. For the purpose of holdmg each plunger in its active or its inactive position I provide a leafspring 10 secured to the block and having attached thereto a pin 11 tomove in the block so as to engage eithgr of a pair of openings 12 in theplunger It is, of course to be understood that the invention may beconstructed in various other manners and the parts associated in otherrelations and, therefore, I do not desire to be limited in any mannerexcept as set forth in the claims hereunto appended.

Having thus described my invention what I claim is- 1. A. straight edgecomprising a body, a block for each end of the body, a member slidablyconnecting each member of the block with the body, a thumb screw forlocking the block in adjusted position, and a plunger adjustably mountedin eachblock for movement in a direction opposite from the movement ofthe block.

2. A straight edge comprising a body, a block, a U shaped member securedto the block and having its limbs slidably mounted in the body, a thumbscrew for binding action on the member, a plunger slidably mounted inthe block, and a spring actuated catch for holding the plunger inadjusted positions.

3. A straight edge comprising a body having parallel slots arranged ineach end thereof, a U shape member having its limbs movably mounted inthe slots in one end of the body, a thumb nut for clamping the limbs inthe slot, a block secured to said WALTER LYMAN CLARK.

